JPH09217359A - Precast concrete foundation, its connecting structure, and form for manufacturing precast concrete foundation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the connection in the connecting part of precast concrete foundations, and simplify the work. SOLUTION: In a precast concrete foundation 10 having a foundation body 12 and a connecting part 20 provided on the end part thereof, two precast concrete foundations 10 are mutually connected, and concrete is placed in a concrete filling space 50 formed between the connecting parts 20 arranged opposite to each other, whereby they are mutually integrated. The connecting part 20 has a connecting piece 30 having a base end formed of the end part of the foundation body and protruded from the base end to partition the concrete filling space 50, and the connecting piece 30 has reinforcements 32-1, 32-2 protruded to the concrete filling space 50 and extending along the protruding direction of the connecting piece 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete foundation, its connecting structure, and a mold for manufacturing the precast concrete foundation.

[0002]

BACKGROUND OF THE INVENTION In order to mount a building in a stable state, it is first necessary to construct a foundation part on the ground in a stable and appropriate manner. Conventionally, the foundation part for a house first forms a root cutting part by continuously excavating the ground of the building construction part, laying gravel on this root cutting part to assemble a formwork, and form this mold through a supporting means. It was constructed by standing and supporting the frame, and then pouring concrete into this form, curing and solidifying it, and then removing the form and mortaring the surface.

In the conventional foundation construction work, the work of continuously erecting the formwork along the root cutting portion is
It was time consuming and led to a longer construction period and increased costs. Also, the work of curing the concrete requires several days, which is a cause of prolonging the construction period, and further, the removal of the formwork and the mortar treatment are labor-intensive works.

Therefore, in order to further simplify and speed up the work for constructing the foundation at the construction site, a construction method is considered in which a precast concrete (hereinafter referred to as PC) foundation manufactured in advance at the factory stage is installed in the root cutting portion. It was

As an example of this PC base, for example, those disclosed in Japanese Patent Application Laid-Open No. 6-272263, Japanese Patent Application Laid-Open No. 6-235223, etc., filed by the applicant of the present invention, can be cited.

FIG. 9 shows a state in which the PC foundations are joined and connected. In the figure, the PC foundation 400 is provided with connecting portions 404 at both ends of a rising portion 402 formed in a substantially rectangular plate shape, and a compound reinforcement 406 is provided on a side surface of the connecting portion 404 along the rising direction. Two are projected in the extended state. When connecting the PC foundations 400, 400 to each other, the connecting portions 404 are opposed to each other and joined, and two reinforcing bars 408 and 408 for reinforcement are provided on these two compound reinforcing bars 406 (a total of four if opposed). Connect each,
A concrete filling space 412 is formed so as to wrap the reinforcing reinforcing bar 408 and the compound reinforcing bar 406 by connecting the reinforcing reinforcing bar 408 and the compound reinforcing bar 406 with a wire or the like and attaching the forms 410, 410 to the connecting portions 404, 404. Then, by placing and joining concrete in the concrete-filled space 412, the adjacent PC foundations 400, 400 are integrally and firmly connected to each other.

However, in the case of using the longitudinally long compound reinforcement 406 as described above, as shown in FIG. 9, in one connection portion 404, the reinforcement arrangement network 41 inside the PC foundation 400 is used.
4 orthogonally to the pair of upper and lower horizontal stripes 2 independently of each other
Since the two compound reinforcing bars 406, 406 are connected to each other, the adjacent compound reinforcing bars 406 are connected to each other by the reinforcing steel bars 408, and the connecting structure after the concrete filling space 412 is filled with concrete and solidified, However, the force transmission in the arrow Z direction shown in FIG. 9 is weak, and it has been desired to further increase the connection strength.

Further, two reinforcing bars 408, 40 for reinforcement are provided.
Since 8 had to be attached to each of the upper and lower parts, it took a lot of time for the construction work.

Further, there is a problem that two pieces of compound reinforcements 406, 406 as shown in FIG. 9 are required for one connecting portion 404, and the number of parts is large.

Incidentally, a technique for solving the above-mentioned problems was developed by the Japanese Patent Information Organization (JAPIO) in the prior art search (Patris).
The following search formula was used to search for patent applications and utility model registration applications after 1980.

Search formula: E02D 27/01 101C
+ E02D 27/01 101D As a result, Patent 81
We extracted 67 cases and utility model registration applications. However, a technique for solving the above problems has not been found.

[0012] The present invention has been made to solve the above-mentioned problems of the technology, and its object is to connect the reinforcing bars in the connecting portion when connecting the precast concrete foundations. (EN) Provided are a precast concrete foundation, a connection structure thereof, a formwork for manufacturing the precast concrete foundation, and a foundation construction method capable of strengthening the structure and simplifying the work.

[0013]

Means for achieving the above object will be described by associating the constituent elements of each claim of the present application with the reference numerals of the embodiments of the present invention.
The precast concrete foundation according to the invention described in
Concrete formed by connecting at least two precast concrete foundations (10) having a base body (12) and a connecting portion (20) at the end thereof to each other, and between the connecting portions arranged to face each other. A precast concrete foundation in which concrete is poured into a filling space (50) to be integrated, and the connecting portion is formed so as to project from the end portion of the foundation body and to be the concrete filling. A connecting piece (30) for partitioning the space is provided, and the connecting piece has a reinforcing bar (32) projecting into the concrete-filled space and extending along a direction in which the connecting piece projects.

According to the first aspect of the present invention, since the reinforcing bar is provided so as to extend in the direction in which the connecting piece projects, the connecting piece projects in the projecting region of the reinforcing bar. Directional force transmission is enhanced.

Thus, if the reinforcing bars are used when connecting adjacent connecting pieces, the connecting strength at the time of connection can be increased.

A precast concrete foundation according to a second aspect of the present invention is the precast concrete foundation according to the first aspect, wherein the bar arrangement is
A connecting bar (33), which is installed at different positions in the height direction and connects the reinforcing bars at different positions in the height direction, is embedded inside the connecting piece.

According to the second aspect of the present invention, the bar arrangements installed at different positions in the height direction are connected inside the connecting piece, which is the advantage of the conventional compound bar in the rising direction. It is possible to strengthen the strength in the direction in which the connecting piece protrudes and the tensile stress resistance without impairing the shearing resistance at the same time, and it is possible to further increase the connecting strength when the adjacent connecting parts are connected to each other. Become.

Further, by integrally forming the reinforcing bars in this way, it is possible to reduce the number of members while securing the above-mentioned strength.

The connecting structure according to the invention described in claim 3 is
At least two precast concrete foundations having a foundation body and a connection portion at an end thereof are connected to each other, and concrete is poured into a concrete-filled space formed between the connection portions arranged to face each other. A connecting structure of precast concrete foundations to be integrated, wherein each of the connecting portions of each of the precast concrete foundations has an end portion of the foundation body as a base end, and is formed so as to project from the base end. Each of which has a connecting piece for partitioning, the connecting piece of each of the connecting portions is provided so as to project into the concrete-filled space, and each has a reinforcing bar extending along a direction in which the connecting piece protrudes, and each of the adjacent ones Reinforcing bars are connected to each other by reinforcing reinforcing bars (60) extending in a direction in which the connecting piece protrudes, and the concrete filling space is filled with concrete. It is characterized in.

According to the third aspect of the present invention, when two PC foundations arranged adjacent to each other are connected by the connecting portion, the bar arrangement formed in the connecting portion of one of the PC foundations and the other one. And the bar arrangement formed in the connection portion of the PC base of (1) exist on a straight line in the lateral direction that is the direction in which the connection piece projects.

If these reinforcing bars are connected by reinforcing steel bars,
Force transmission in the lateral direction is strengthened compared to the conventional compound reinforcement that extends in the vertical direction, and the connection state at the connection part is strengthened,
It is possible to further strengthen the connection between the one and the other PC bases.

The connecting structure according to the invention of claim 4 is
The reinforcing bar (60) according to claim 3, wherein the reinforcing bars are installed at different positions in the height direction, and the reinforcing reinforcing bars (60) are adjacent to each other at substantially the same height position of each of the adjacent connecting pieces. It is characterized by having a horizontal bar (62) connecting the bar arrangements and a vertical bar (64) connected to the horizontal bar and connecting the bar arranged at different positions in the height direction.

According to the fourth aspect of the present invention, the longitudinal reinforcement of the reinforcing reinforcing bar strengthens the shearing resistance in the rising direction, and the adjacent reinforcements are connected at different positions in the height direction. By further connecting the muscles, in the connected state of the connecting portions, the connection strength is further increased as compared with the conventional case of only the horizontal muscles.

Further, unlike the conventional case, a plurality of reinforcing reinforcing bars are not used, the vertical reinforcing bars and the horizontal reinforcing bars are integrally formed, and the reinforcing reinforcing bars are installed on the reinforcing bar and are uniquely strong. Since it will be in a state that can form a simple connection structure,
A strong connection can be secured while simplifying the construction work.

Further, when connecting the reinforcing bars to the reinforcing bars, the adjacent reinforcing bars can be used as shelves. Therefore, by adjusting the longitudinal bars of the reinforcing bars, the connecting positions of the reinforcing bars can be changed. Exactly accurate.

A preform for producing a precast concrete foundation according to a fifth aspect of the present invention is a preform for producing a precast concrete foundation according to the first aspect of the present invention. A box-shaped mold (100) that holds the shape, and a plurality of moving means (14) that can move along the longitudinal outer surface of the mold.
0), the mold is connected to one of the moving means, and the base end defining mold part (112) for defining the base end in the mold and the other moving means. A distal end face defining mold part (110) which is connected to the base end defining mold part and faces the base end defining part, and defines a distal end face of the connecting piece protruding from the base end. And

According to the invention described in claim 5, the base end face defining mold portion and the tip end face defining mold portion can be independently moved by the movement of the moving means. You can freely change the selection.

It should be noted that by providing the tip surface defining mold portion at both ends, the length of the precast concrete foundation can be freely selected, and the precast concrete foundation having a desired length can be manufactured.

A foundation construction method according to a sixth aspect of the present invention is a foundation construction method using the precast concrete foundation according to the first aspect, wherein at least the connecting portions are butted to each other in a building construction area. A step of arranging precast concrete with each other in a state, a step of connecting and arranging each bar of adjacent connecting parts in a direction in which the connecting piece projects, and placing concrete in a concrete filling space. It is characterized by including.

According to the sixth aspect of the present invention, the connecting portions of the precast concrete foundation are abutted against each other and the reinforcing bars are connected and arranged in the direction in which the connecting pieces protrude, whereby in the connecting structure after solidification of concrete. It is possible to simplify the construction work while increasing the connection strength.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example of a preferred embodiment of the present invention will be specifically described with reference to the drawings.

<Foundation Structure> First, FIG. 2 is used to outline the entire foundation structure constructed in the building construction area prior to the precast concrete (hereinafter referred to as PC) foundation 10 which is a characteristic constitution of the present invention. Explain.
FIG. 2 is an overall perspective view of the basic structure according to the present embodiment. In the figure, a PC bottom plate 4 is installed at a corner portion and a predetermined position of a root cutting part 2 formed by digging the ground, and a PC foundation 10 is installed between the PC bottom plates 4.

The PC bottom plate 4 is a reinforced concrete plate having reinforcing reinforcing bars (not shown) inside. Therefore, since reinforcing bars are built in the PC bottom board 4 in advance, the work of disposing the reinforcing bars on the PC bottom board 4 at the construction site can be omitted. In addition, this PC bottom board 4 has a smooth upper surface, and the PC base 10
The marking can be done on this upper surface when erection.

As shown in FIG. 2, the PC foundation 10 includes a rising portion 12 as a foundation body and a connecting portion 20.

The rising portion 12 stands upright in the vertical direction and mounts and supports the building on the upper end surface 12a. The rising portion 12 is formed in a rectangular parallelepiped plate shape with a predetermined length and thickness. As shown in FIG. 4, a reinforcing bar net 34 formed by assembling a plurality of reinforcing bars is embedded in concrete (details will be described later). Grooves 14 for footing portions are formed on both side surfaces of the lower end region of the rising portion 12.

There are two types of the PC foundation 10, one having the connecting portions 20 formed at both ends of the rising portion 12 and one of the rising portions 12 having one end portion as shown in FIG. A connection part 20 is formed, and the other end is connected to another PC foundation 10 at a right angle, so that a projecting connection part 20 'protruding at a right angle to the axis is formed as shown in FIG. There is. The connecting portion 20 'may be formed at another place or at both ends, as long as it has at least a convex connecting portion. The surface of the PC foundation 10 is in a finished state.

<Regarding the connection part of the PC base> Here, the connection part, which is a characteristic configuration of the present invention, will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 1 is a perspective view showing an example of an embodiment of a PC base according to the present invention. In this example, P
The C foundation 10 is characterized by the inner surface of the connecting portion 20.

The connecting parts 20 are formed on both ends or one end of the main body of the PC base 10, and as shown in FIG.
A concrete form 40 is formed between adjacent thick-walled portions 22 of two PC foundations 10 that are configured to include and connect a thick-walled portion 22 as an end of the rising portion 12 that is the main body of the foundation 10 and a connecting piece 30. By mounting and arranging reinforcing steel bars 60 between the concrete form 40 and the connecting piece 30 and placing concrete, the connection is integrated.

The thick-walled portion 22 is formed from the connecting piece 30 from the center in the longitudinal direction, and the distance in the longitudinal direction is sufficient to allow the mold 40 to come into surface contact with each other, and to form the concrete filling space 50. 40 has a function of arranging 40 apart from the connection piece 30 and holding the connection piece 30.
A recess 26 is formed in the base end face 24 from which the connecting piece 30 projects between 0. Then, the thickness is gradually reduced from the thick portion 22 toward the longitudinal center direction,
The surface of the thick portion 22 and the surface of the rising portion 12 are formed in an obliquely continuous shape by a slope.

In addition, the thick-walled portion 22 has a mold-fixing hole 23.
A plurality of, for example, two are formed, and the bolts 80 are inserted into the holes 42 and the mold fixing holes 23 of the mold 40, which will be described later, to fix the mold 40 and the PC foundation 10. The mold 40 may be pre-installed at the factory stage. The recess 26 is provided so as to face the inner surface of the concrete-filled space 50, and concrete should flow into the recess 26 during solidification and solidify. Is for strengthening the tight-bonding property between the solidified concrete and the connection portion 20, and a plurality of, for example, four (reference numeral 26-1, 26-2, 26-3 in FIG. 1
・ 26-4) It is provided.

The connecting piece 30 has a base end face 24 of the thick portion 22, which is an end of the rising portion 12 as a base body, as a base end,
It has a function of partitioning the concrete-filled space 50 by being formed so as to project from the base end, is configured to include the bar arrangement 32, and the corners of the connecting piece 30 are chamfered.

As shown in FIG. 11, the convex connecting portion 20 'is formed with a plurality of recesses 26, for example, four similar to the connecting portion 20, and the reinforcing bars 21 are orthogonal to each other from at least two recesses 26. It is protruding in the state. By forming the bar arrangement 21 in advance, the bar arrangement 2 is formed in the joint region having an L-shaped cross section.
1 and the bar arrangement 32 described later can be firmly connected, and the on-site work can be simplified.

The bar arrangements 32 are provided so as to project into the concrete-filled space 50 and extend along the direction in which the connecting pieces 30 project, and as shown in FIG. 1, at different positions in the height direction. A plurality of, for example, two stages, that is, a reinforcing bar 32-1 protruding upward and a reinforcing bar 32-2 protruding downward are included.

More specifically, as shown in FIGS. 3 and 4,
A bar arrangement net 34 as a main bar is embedded in the main body of the PC foundation 10, and a bar reinforcing bar 32 as a compound bar is embedded in the connecting piece 30 in a state of being connected to the bar net 34 by welding or the like. The two ends of the bar arrangement 32 project from the connecting piece 30 to form bar arrangements 32-1 and 32-2.

The bar arrangement network 34 includes a pair of upper and lower horizontal bars 38, 38.
And a plurality of vertical ribs 36 installed between the horizontal ribs 38.
And are formed by.

The bar arrangement 32 is a pair of upper and lower bar arrangements 32-1 each having a substantially U-shaped cross section and projecting into the concrete filling space 50.
32-2 and connecting bar arrangements 33, 33 connecting the bar arrangements 32-1 and 32-2 in the height direction are integrally formed, and the connecting bar arrangements 33, 33 are horizontal bars at both upper and lower ends. It is embedded in the inside of the connecting piece 30 in a state of being connected to 38.

As shown in FIG. 1, the reinforcing reinforcing bar 60 has at least a portion extending along the direction in which the reinforcing bar 32 is formed and has two lateral reinforcing bars 6 whose ends are bent.
2-1, 62-2 and two straight vertical stripes 64, 64
And are assembled and fixed at a right angle.

When the adjacent PC foundations 10 are connected to each other, as shown in FIGS. 1 and 3, in the reinforcing bar 60, the horizontal bar 62-1 has one horizontal bar 62-1 on the upper side and the other bar 32-1 on the other side. It connects with the bar arrangement 32-1, and the horizontal bar 62-2 connects with one of the lower bar arrangement 32-2 and the other bar arrangement 32-2. That is, the adjacent reinforcing bars 32-1 and 32-1 are connected to each other and the reinforcing bars 32-2 and 32-2 are connected to each other by the reinforcing bar 60, and the concrete filling space 50 is filled with concrete. The PC bases 10 and 10 are connected to each other.

The concrete-filled space 50 connects at least two PC foundations 10 to each other, and is formed between the connection piece 30 and the mold 40 which are arranged to face each other. Then, concrete is poured into the concrete filling space 50 to integrate the PC foundations 10 and 10 with each other.

By the reinforcing bar 32 and the reinforcing bar 60,
Since the two PC foundations 10 are connected to each other, after the concrete is solidified, in the concrete filling space 50, the reinforcing bar 60 and the reinforcing bar 60 are connected to each other in the solidified concrete. Become.

At this time, the conventional vertically long compound bar 40 shown in FIG.
As compared with 6, the bar arrangement 32 is formed in a horizontally long shape with a substantially U-shaped cross section.
Thereby, the strength and the transmission of force in the direction A shown in FIG. 3 are enhanced. The vertical streaks 64 strengthen the shearing resistance in the rising direction at a position near the bar arrangement 32, and each bar arrangement 32 in the lateral direction.
By connecting the horizontal stripes 62 connecting the two in the vertical direction, the force transmission in the A direction shown in FIG. 3 is further strengthened.
The connection strength is further increased.

Further, since the vertical reinforcement 64 projects downward from the lower horizontal reinforcement 62-2, the upper and lower horizontal reinforcements 62-1 and 62-2 of the reinforcing bar 60 are adjacent to each other. It can be stored at a predetermined position, and the reinforcing reinforcing bar 60 can also be used as a jig for securing dimensions.

Furthermore, the upper and lower bar arrangements 32-1 and 32-2
Has a structure in which it is connected and integrated by the connecting bar 33 inside the connecting piece 30, so that it can be firmly connected to the bar net 34. That is, conventionally, as shown in FIG.
The strength in the Z direction was comparatively weak because the compound reinforcement 406 was independently connected to each of the fourteen. On the other hand, in the present invention, the reinforcing bars 32-1 and 32-
Since 2 is extended in the lateral direction but is integrally formed in the upper and lower directions, the lateral coupling strength is further increased without impairing the shear resistance in the rising direction, which is an advantage of the conventional compound reinforcement. It becomes possible.

Furthermore, when this concrete is solidified, it is firmly pushed into the concave portion 26 and fixed, and has a large strength against the shearing force in the connecting region between the adjacent PC foundations 10 and 10. In this way, the adjacent PC foundations 10 are firmly connected to each other.

When the PC foundations 10 and 10 are integrated with each other as described above, the adjacent PC foundations 10 and 10 have the bar arrangements 32 extending in the direction in which the connecting pieces 30 project, respectively. Concrete is filled into the concrete filling space 50 in a state where the adjacent bar arrangements 32 are connected to each other, so that the concrete filling spaces 50 are firmly connected.

<Regarding Manufacturing Form> Next, a manufacturing form for manufacturing the PC base 10 will be described with reference to FIGS. 5 and 6. FIG. 5 shows a PC base 10 according to this embodiment.
It is a perspective view which shows the form 100 for manufacture of. FIG.
It is a perspective view which shows the manufacturing form of C foundation. FIG. 6 shows FIG.
It is a sectional view showing a part of manufacturing frame 100 of. The manufacturing form 100 for manufacturing the PC foundation 10 of this example shows a case where the rising portions 12 have the connecting portions 20 at both ends.

As shown in FIGS. 5 and 6, the PC basic manufacturing mold includes a mold 100 and a plurality of moving means 140.

As shown in FIG. 5, the mold 100 is formed in a box shape elongated in one direction, has a function of holding the poured concrete in a predetermined shape, and has a bottom surface and a side surface of the poured concrete. It has a smooth inner surface so that it can be specified in the surface-treated state.

The moving means 140 has a function of independently sliding in a plurality of local regions along the longitudinal outer side surface 102 of the mold 100, and a plurality of, for example, one side surface and eight other side surfaces are formed ( Reference numerals 140-1, 140-2, 140-3, 140 on one side 102 of the mold 100 of FIG.
-4, 140-5, 140-6, 140-7, 140-
8).

More specifically, the moving means 140 (140-
1.140-2, 140-7, 140-8), a rail member 142 laid along the longitudinal outer side surface 102 of the mold 100, and a rail member 142 movably arranged on the rail member 142. Carriage 144 which can reciprocate between one end and the other end of the longitudinal outer side surface 102 of the vertical mold 100, and the carriage 14
The support plate 146 (146-1) that rotatably supports the rotating shaft of No. 4 and is installed above the mold 100 so as to straddle the mold 100.
・ 146-2 ・ 146-7 ・ 146-8)

On the other hand, the moving means 140 (140-3.1
40-4, 140-5, 140-6), the support plate 148 is formed shorter than the support plate 146, and is formed along the longitudinal side surface of the central region of the mold 100. The footing part groove forming die part 120 is supported by a plurality of adjacent support plates 148.

As shown in FIG. 5, the rail members 142 may be laid in a pair along both longitudinal outer side surfaces 102, 102 of the form 100, or may be provided only on one side surface 102. May be Further, graduations may be provided on the rail member 142 at module intervals (not shown). Furthermore, the rigidity of the rail member 142 may be increased and the rail member 142 may be integrated with the form 100. In this case, the plates and the like that form the mold 100 can be formed thin.

As shown in FIG. 5, the mold 100 includes a base end defining mold 112, a tip surface defining mold 110, an outer surface defining mold 116, and a footing groove forming mold 120. Consists of inclusive.

The tip surface defining mold portion 110 is moved by the moving means 14
0 For example, 140-1 and 140-8 support plates 146-1 and
146-8 and a distal end surface 30a of the connection piece 30 which is disposed inside the mold 100 so as to face the proximal end defining mold 112 and projects from the proximal end surface 24 (FIG. 1). Has the function of defining

The base end defining mold 112 is moved by the moving means 140.
For example, the formwork 100 is connected to 140-2 and 140-7.
Has a function of defining the base end face 24 (FIG. 1) on the inner side,
It is configured to include a recess defining mold 114 and an inner surface defining mold 115.

As shown in FIGS. 5 and 6, the recess defining mold 114 has a function of defining the recess 26 (FIG. 1) by protruding from the defining surface of the base defining mold 112. For example, four pieces are projected. In this way, the base end defining mold 112
Since the surface 112 is formed in a concavo-convex shape, when the mold 112 is used, the concave portion 26 is formed on the inner side surface of the connecting portion 20 of the PC base 10.

The inner surface defining mold 115 is used for the PC foundation 10
Corresponding to the end shape of the mold 100, is provided inside both ends of the mold 100, extends at right angles from the base end defining mold 112, and is spaced a predetermined distance from the bottom surface 100a of the mold 100 inside the mold 100. It is attached in a floating state and has a function of defining the inner surface (reference numeral 30b of FIG. 1) of the connection piece 30, and the connection piece 30 is provided at the end of the PC board 10 by the inner surface defining mold portion 115. To be formed.

The outer surface defining mold portion 116 is used for the PC foundation 10.
In the above, the thickened portion 220 defines the tapered surface 22a (FIG. 1) formed by laterally projecting.

An upper mold (not shown) is provided above the mold 100 to define an upper surface of the concrete which is placed at a position facing the bottom surface 100a of the mold 100 and poured. The upper formwork is arranged so that the inside of the intermediate region is sealed and the inside of the end region is opened.

A groove 14 for a footing portion is formed in the PC base 10 and the groove 14 for a footing portion is formed in the die portion 12 for forming a footing groove shown in FIG.
It is formed by installing 0 on the bottom surface of the mold 100 and on the concrete pouring side on the bottom surface.

The mold 100 is constructed as described above, and each of these defines the contour of the PC foundation 10.

Next, a method of manufacturing the PC base 10 using the manufacturing frame 100 will be described with reference to FIGS.

As shown in FIGS. 5 and 6, in the mold 100, the length of the PC base 10 to be manufactured, for example, L
Corresponding to the above, the front surface defining mold parts 1 at both ends of the mold 100
Set the distance between 10 and 110 to L. At this time, the front end face defining mold parts 110, 110 are respectively moved by the moving means 140-1.
-Since 140-8 can slide on the pair of rail members 142, 142, it can be easily adjusted to a desired length. If the rail member 142 is graduated at module intervals (not shown), the adjustment becomes easier.

Further, in accordance with the length of the connecting portion 20 of the PC base 10 to be manufactured, for example, l, the tip surface defining mold portion 110 on one end side of the mold 100 and the base end defining mold portion on one end side thereof. The distance between 112, and the front end surface defining mold portion 1 on the other end side
The distance between 10 and the base end defining mold 112 on the other end side is set to 1 respectively. At this time, the front end surface defining mold portion 110 and the base end defining mold portion 112 are respectively moved by the moving means 140-1.
Since the pair of rail members 142, 142 can be slid by 140-2, 140-7, 140-8, the length can be easily adjusted to a desired length.

Therefore, the length of the PC foundation 10 and the connecting portion 2 can be changed by freely moving the respective mold parts by the moving means.
The length of 0 can be adjusted freely, and various building plans can be accommodated.

Further, as shown in FIG.
Is inserted into the mold 100, and an upper mold (not shown) is attached to an end region of the mold 100.

In this way, the mold for manufacturing the PC base is constructed, and then concrete is filled. Specifically, the concrete is filled through the opening 130 (FIG. 6) in either end region. Then, the concrete poured from the opening 130 in the one end region is deflated by the opening 130 in the other end region and filled in the mold 100. Therefore, a good PC foundation 10 can be manufactured without forming an air pocket between the mold and the frame. The PC base 10 thus manufactured is shown in FIGS. 1 and 2.

<Basic Construction Method> Next, a basic construction method using the PC foundation 10 will be described with reference to FIGS. 2 and 8.

The PC foundation 10 is manufactured in advance at the factory stage and transported to the construction site. The surface of the PC base 10 is preliminarily processed at the factory stage.

At the construction site, as shown in FIG. 2, the ground is dug up to form the root cutting portion 2, and the PC bottom board 4 is installed at a corner portion and a predetermined position of the root cutting portion 2.

Here, when the PC bottom plate 4 is installed in the root cutting part 2, a pile of discarded concrete or mortar is placed at the installation position of the PC bottom plate 4, and the pile of the discarded concrete is crushed. Place the bottom plate 4. Then, the PC bottom board 4 is hit with a hanging arrow or the like to perform an adjustment work so that the upper surface becomes horizontal at a predetermined height. Note that this work is performed while checking the horizontal level and height using a water thread, a level, a level position by a laser beam, or the like. In this way, all the PC bottom plates 4 are horizontally installed at the same predetermined height.

Next, the PC foundation 10 is installed between the PC bottom plates 4. At this time, since the PC bottom board 4 has already been installed horizontally at a predetermined height, the PC foundation 10 becomes horizontal at a predetermined height simply by being installed between the PC bottom boards 4. Therefore, the installation work of the PC base 10 is completed only by marking out the installation position of the PC base 10 on the upper surface of the PC bottom board 4 and placing the PC base 10 while checking only the installation position. Therefore, this PC foundation 10 can be placed on the PC bottom plate 4 with the lower end surface of the connecting portion 20 as the erected portion.

Then, the next PC foundation 10 is installed adjacent to the existing PC foundation 10, and both are temporarily fixed by a jig (not shown). An enlarged perspective view of the adjacent PC foundations 10 is shown in FIG.

Next, as shown in FIG. 1, the mold 4 is inserted between the adjacent thick wall portions 22 of the two PC foundations 10 to be connected.
0 is attached, and the reinforcing bar 60 is arranged between the form 40 and the connecting piece 30. The form 40 may be attached to the connecting piece 30 in advance at the factory.

After that, in the reinforcing bar 60, the horizontal bar 62-1 is connected to the one upper bar 32-1 and the other bar 32-1 and the horizontal bar 62-2 is the one lower bar 32-2. And the other reinforcing bar 32-2.

At this time, since the PC foundation 10 is continuously provided with the connecting portions 20 opposed to each other and the molds 40 and 40 are attached, the concrete filling space is formed by the connecting pieces 20 and 20 and the molds 40 and 40. 50 is formed.

Next, concrete is poured into the concrete-filled space 50 in which the reinforcing bars 60 are thus attached. Then, the concrete-filled space 50 is filled with concrete, and the concrete also flows into the recesses 26 formed inside the connection portion 20 to fill the concrete-filled space 50 with concrete.

By the bar arrangement 32 and the reinforcing steel bar 60,
Since the two PC foundations 10 are connected to each other, after the concrete is solidified, in the concrete filling space 50, the reinforcing bar 60 and the reinforcing bar 60 are connected to each other in the solidified concrete. Become.

At this time, the conventional vertically long compound bar 40 shown in FIG.
As compared with 6, the bar arrangement 32 is formed in a horizontally long shape with a substantially U-shaped cross section.
Thereby, the connection strength in the A direction shown in FIG. 3 is enhanced.

By doing so, the concrete filling space 5
After concrete flows into 0 and solidifies, PC
The connection strength at the connection portion of the base 10 is strengthened, the shear resistance is increased, and the connection between the one and the other PC bases 10 and 10 can be made stronger than in the conventional case.

Further, when the concrete is cured, the concrete is solidified in a state where it is difficult to fit in the concave portion 26. Therefore, against the shearing force in the connection region (concrete filling space 50) between the connection parts 20 of the PC foundation 10. Having great strength, the PC foundation 10 is firmly connected. Since the concave portion 26 is formed, when concrete is poured into the connecting portion 20, the concrete enters the concave portion 26 and clings to it, so that the joined PC foundations 10 are firmly fixed to each other.

In this case, when the concrete poured into the concrete-filled space 50 formed in the connection portion 20 solidifies, not only the shearing force but also the lateral pulling force is exerted in the connection area of the PC foundation 10. In contrast, the basic structure has great strength.

Furthermore, as shown in FIG.
PC bottom board 4 in the lower end area (footing formation space) of 2,
After installing the base reinforcement 70 between the four and attaching the side frames 72, 72 on the ground along the base reinforcement 70,
The footing portion may be formed on the ground by filling concrete 74 between the two 72 and curing and hardening. At this time, since the groove 14 for the footing portion is preliminarily formed in the lower portion of the PC foundation 10 at the factory stage, a strong connection with the concrete forming the footing portion can be achieved, and the strength of the foundation increases.

Further, when the ground is weak and the ground pressure is insufficient in the PC bottom plate 4, a pedestal made of PC for supporting the rising portion 12 may be arranged between the PC bottom plates 4 and 4.

As described above, the present embodiment has the following effects. (1) Compared to the conventional vertically long compound reinforcement 406 shown in FIG. 9, the laterally arranged reinforcement 32 having a substantially U-shaped cross section enhances the force transmissibility in the A direction shown in FIG. .

(2) When two PC foundations arranged adjacent to each other are connected by a connecting portion, the bar arrangement formed in the connecting portion of one PC foundation and the connecting portion of the other PC foundation are formed. The arranged reinforcements are present on a straight line in the lateral direction in which the connecting piece projects. If each reinforcing bar is connected by a reinforcing bar, the tensile stress resistance in the lateral direction is strengthened as compared with the conventional longitudinally extending compound bar, and the connected state at the connecting portion is strengthened, and one and the other. It is possible to further strengthen the connection between the PC bases.

(3) By the longitudinal bar 64 of the reinforcing bar 60,
Strengthening the shearing resistance in the rising direction, and each adjacent bar arrangement 3
Reinforcing bar 32 at different positions in the height direction where the two are connected
By further connecting 1.32-32, the connection strength is further increased in the connected state of the connecting portions, as compared with the case where only the horizontal streak is used as in the related art. Also, without using a plurality of reinforcing bars as in the past, it is integrally formed by connecting the vertical bars and the horizontal bars, and the reinforcing bars are installed on the bar arrangement and have a uniquely strong connection structure. Since it is in a state where it can be formed, it is possible to secure a strong connected state while simplifying the construction work. Furthermore, when connecting reinforcing bars to each reinforcing bar, adjacent reinforcing bars can be used as shelves, so by adjusting the longitudinal bars of the reinforcing bars, the connecting position of the reinforcing bars can be accurately displayed. .

(4) The bar arrangement 32 is the bar arrangement 3 having a substantially U-shaped cross section.
2-1 and 32-2 are formed integrally in the upper and lower sides while extending in the lateral direction, so that the lateral direction can be maintained without impairing the shear resistance in the rising direction, which is an advantage of the conventional compound reinforcement. It is possible to further increase the connection strength of the.

(5) Since the concave portion is formed on the inner side surface of the connecting portion facing the concrete-filled space, if this PC foundation is connected in series with the connecting portions facing each other to form the concrete-filled space. The concrete flows into the concave portion that opens when the concrete is placed in the space.
Then, when the concrete is solidified, the concrete is pushed into the concave portion and is firmly fixed, and the shearing resistance is increased, so that the adjacent PC foundations are firmly fixed to each other.

(6) The length of the PC foundation 10 and the length of the connecting portion 20 can be freely adjusted by freely moving the mold parts by the moving means, and various building plans can be dealt with.

(7) By connecting the connecting portions of the precast concrete foundation to each other and connecting and arranging the respective reinforcing bars in the direction in which the connecting pieces protrude, the construction can be performed while increasing the connecting strength in the connecting structure after solidification of concrete. The work can be simplified.

(8) If, for example, a plurality of recess forming molds are formed, the concavities and convexities are formed with reference to the inner surface, so that the PC
When the foundations are connected to each other and the concrete is placed in the concrete filling space, the unevenness and the concrete are meshed with each other to be firmly integrated.

Although the apparatus and method of the present invention have been described in accordance with some specific embodiments thereof, those skilled in the art can practice the invention described in the text of the present invention without departing from the spirit and scope of the invention. Various modifications can be made to the form. For example, it can be applied to a connection structure having a substantially T-shaped cross section as shown in FIG.

In the figure, the PC foundation is a PC foundation 200 that supports the bottom of a building wall and serves as an outer foundation, and a PC foundation 250 that is built inside the outer foundation and serves as an inner foundation that supports the floor of the building. And consists of. And each PC foundation 20
The connecting parts 210 and 260 are formed at the ends of the parts 0 and 250.

Here, the connecting pieces 210 and 260 are provided with reinforcing bars 212 and 262 as compound bars so as to project from each PC.
When connecting the foundations 200, 200, the bar arrangement 212,
Reinforcing rebar 220 is attached to 212, PC foundation 200
When connecting 250, the reinforcing reinforcing bar 220 and the reinforcing bar 230 are connected by the reinforcing reinforcing bar 230. Thereafter, a formwork (not shown) is attached and fixed along the dotted line F in FIG. 7 in the same manner as in the above-mentioned embodiment to form a concrete filling space,
Pour concrete.

Furthermore, the PC foundation 10 of the present invention can be applied to not only the above-mentioned connection structure having a substantially T-shaped cross section but also a connection structure having a substantially cross-shaped cross section, a substantially L-shaped cross section, and the like. Further, there may be a PC base having a connecting portion shaped as shown in FIG.

Further, as shown in FIG. 8, the present invention can also be applied to a PC foundation 300 having a connecting portion formed in a substantially U-shaped cross section. In the figure, the PC foundation 300 has a pair of connecting pieces 312 and 314 having a substantially U-shaped cross section at the connecting portion 310.
A bar arrangement 320 is provided on the 12th side. The connection piece 31
The bar arrangement 320 may be provided in either one or both of 2 and 314.

Furthermore, the shape of the recess is not limited to the rectangular shape as in the above-mentioned embodiment, but may be any shape such as a circle.

Moreover, the reinforcing bars are not limited to those projecting in two steps, but may be formed in a plurality of upper and lower steps and in a plurality of left and right rows in the connecting portion.

Further, the connecting portion is not limited to the one having a U-shaped cross section, and the inside of the concrete filling space partitioned by the connecting piece protruding from at least one end or both end base ends of the rising portion as the base body is formed. Whatever you do,
Bar arrangements may be formed.

It goes without saying that the mold can also be deformed in accordance with the deformation of the connecting portion.

[0112]

According to the invention of claim 1, it is possible to increase the connection strength in the connection structure after the concrete is filled and solidified.

According to the second aspect of the present invention, it is possible to further increase the connecting strength in the state where the adjacent connecting portions are connected to each other without impairing the shearing resistance in the rising direction, which is an advantage of the conventional compound reinforcement. it can.

According to the third aspect of the invention, the connection state at the connecting portion is strengthened, and the connection between the one and the other PC bases can be further strengthened.

According to the fourth aspect of the present invention, the shearing resistance in the rising direction is strengthened, and the connecting strength is further increased in the connected state of the connecting portions.

According to the invention of claim 5, the base end face defining mold part and the tip end face defining mold part can be independently moved by the movement of the moving means, so that the length of the connecting piece can be freely set. You can change the selection.

According to the invention of claim 6, it is possible to simplify the construction work while increasing the connection strength in the connection structure after solidification of concrete.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a precast concrete foundation according to the present invention.

FIG. 2 is a perspective view showing an entire foundation structure using the precast concrete foundation of FIG.

FIG. 3 is a cross-sectional view showing a connection structure in which the precast concrete foundations of FIG. 1 are connected to each other.

FIG. 4 is a perspective view showing a state of internal reinforcement of the precast concrete foundation shown in FIG. 1.

5 is a perspective view showing a mold for manufacturing the precast concrete foundation of FIG. 1. FIG.

FIG. 6 is a cross-sectional view showing a part of the manufacturing mold of FIG.

FIG. 7 is a plan view showing another connection structure using the precast concrete foundation shown in FIG.

FIG. 8 is a perspective view showing an example of another embodiment of the precast concrete foundation according to the present invention.

FIG. 9 is a perspective view showing a conventional connection structure between precast concrete foundations.

FIG. 10 is a perspective view showing an example in which a footing portion is formed on site using the precast concrete foundation of FIG.

FIG. 11 is a perspective view showing an example of an embodiment of a precast concrete foundation according to the present invention.

[Explanation of symbols]

10, 200, 300, 400 PC (precast concrete) foundation 12, 402 Standing part 14 Groove for footing part 20, 404 Connection part 26 Recess 30 Connection piece 32-1, 32-2 Bar arrangement 33 Connection bar 34, 414 Reinforcing bars 50, 412 Concrete filling space 60 Reinforcing bars 64 Vertical bars 100 Formwork 102 Longitudinal outside surface 110 Front end surface defining mold part 112 Base end defining mold part 140 Moving means 406 Compound reinforcing bar 408 Reinforcing reinforcing bar

Claims (6)

[Claims] 1. A concrete filling space formed by connecting at least two precast concrete foundations each having a base body and a connecting portion at an end thereof to each other, and the concrete filling space formed between the connecting portions facing each other. Is a precast concrete foundation that is integrated by pouring, and the connection portion has a connection piece that has a base end at the end of the base body and projects from the base end to partition the concrete filling space. The connection piece is provided so as to project into the concrete-filled space,
A precast concrete foundation characterized in that it has reinforcing bars extending along a direction in which the connecting piece projects. 2. The reinforcing bar according to claim 1, wherein the reinforcing bars are installed at different positions in a height direction, and connecting reinforcing bars connecting the reinforcing bars at different positions in the height direction are provided inside the connecting piece. Precast concrete foundation characterized by being buried. 3. A concrete filling space formed by connecting at least two precast concrete foundations each having a foundation body and a connecting portion at an end thereof to each other, and the concrete filling space formed between the opposing connecting portions. Is a connection structure of precast concrete foundations that are integrated by casting, each connecting portion of each of the precast concrete foundations has an end portion of the base body as a base end, and is formed to project from the base end. And a connection piece for partitioning the concrete-filled space, respectively, the connection piece of each of the connection portions is provided to project into the concrete-filled space, each has a bar arrangement extending along the direction in which the connection piece protrudes. The adjacent reinforcing bars are connected by reinforcing reinforcing bars extending in the direction in which the connecting piece projects, and the concrete filling space is filled with concrete. A connection structure characterized by being filled. 4. The reinforcing bar according to claim 3, wherein the reinforcing bars are installed at different positions in a height direction, and the reinforcing bars are adjacent to each other at substantially the same height position of each adjacent connecting piece. A connecting structure comprising: a horizontal bar that connects the matching bar arrangements; and a vertical bar that connects the bar bars and connects the bar bars installed at different positions in the height direction. 5. A manufacturing mold for manufacturing the precast concrete foundation according to claim 1, wherein the mold has a box shape for holding the poured concrete in a predetermined shape, and the length of the mold. A plurality of moving means that are respectively movable along the outer side surface, and the mold is connected to one of the moving means, and defines a base end defining the base end in the mold. And a distal end surface defining mold portion that is connected to the other moving means and is disposed so as to face the proximal end defining mold portion and that defines a distal end surface of the connecting piece protruding from the proximal end. A formwork for producing a precast concrete foundation, which is characterized by having. 6. A foundation construction method using the precast concrete foundation according to claim 1, wherein the precast concrete is arranged in a building construction area with at least the connecting portions abutting each other. A step of connecting and arranging the respective reinforcing bars of the adjacent connecting parts in a direction in which the connecting piece protrudes, and placing concrete in a concrete filling space.